Unity Linux 20.1070a Security Update: kernel (UTSA-2025-989147)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(273986);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/11/05");

  script_cve_id("CVE-2022-49407");

  script_name(english:"Unity Linux 20.1070a Security Update: kernel (UTSA-2025-989147)");

  script_set_attribute(attribute:"synopsis", value:
"The Unity Linux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the
UTSA-2025-989147 advisory.

    In the Linux kernel, the following vulnerability has been resolved:

    dlm: fix plock invalid read

    This patch fixes an invalid read showed by KASAN. A unlock will allocate a
    struct plock_op and a followed send_op() will append it to a global
    send_list data structure. In some cases a followed dev_read() moves it
    to recv_list and dev_write() will cast it to struct plock_xop and access
    fields which are only available in those structures. At this point an
    invalid read happens by accessing those fields.

    To fix this issue the callback field is moved to struct plock_op to
    indicate that a cast to plock_xop is allowed and does the additional
    plock_xop handling if set.

    Example of the KASAN output which showed the invalid read:

    [ 2064.296453] ==================================================================
    [ 2064.304852] BUG: KASAN: slab-out-of-bounds in dev_write+0x52b/0x5a0 [dlm]
    [ 2064.306491] Read of size 8 at addr ffff88800ef227d8 by task dlm_controld/7484
    [ 2064.308168]
    [ 2064.308575] CPU: 0 PID: 7484 Comm: dlm_controld Kdump: loaded Not tainted 5.14.0+ #9
    [ 2064.310292] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011
    [ 2064.311618] Call Trace:
    [ 2064.312218]  dump_stack_lvl+0x56/0x7b
    [ 2064.313150]  print_address_description.constprop.8+0x21/0x150
    [ 2064.314578]  ? dev_write+0x52b/0x5a0 [dlm]
    [ 2064.315610]  ? dev_write+0x52b/0x5a0 [dlm]
    [ 2064.316595]  kasan_report.cold.14+0x7f/0x11b
    [ 2064.317674]  ? dev_write+0x52b/0x5a0 [dlm]
    [ 2064.318687]  dev_write+0x52b/0x5a0 [dlm]
    [ 2064.319629]  ? dev_read+0x4a0/0x4a0 [dlm]
    [ 2064.320713]  ? bpf_lsm_kernfs_init_security+0x10/0x10
    [ 2064.321926]  vfs_write+0x17e/0x930
    [ 2064.322769]  ? __fget_light+0x1aa/0x220
    [ 2064.323753]  ksys_write+0xf1/0x1c0
    [ 2064.324548]  ? __ia32_sys_read+0xb0/0xb0
    [ 2064.325464]  do_syscall_64+0x3a/0x80
    [ 2064.326387]  entry_SYSCALL_64_after_hwframe+0x44/0xae
    [ 2064.327606] RIP: 0033:0x7f807e4ba96f
    [ 2064.328470] Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 39 87 f8 ff 48 8b 54 24 18 48 8b 74 24 10
    41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 7c 87 f8 ff
    48
    [ 2064.332902] RSP: 002b:00007ffd50cfe6e0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
    [ 2064.334658] RAX: ffffffffffffffda RBX: 000055cc3886eb30 RCX: 00007f807e4ba96f
    [ 2064.336275] RDX: 0000000000000040 RSI: 00007ffd50cfe7e0 RDI: 0000000000000010
    [ 2064.337980] RBP: 00007ffd50cfe7e0 R08: 0000000000000000 R09: 0000000000000001
    [ 2064.339560] R10: 000055cc3886eb30 R11: 0000000000000293 R12: 000055cc3886eb80
    [ 2064.341237] R13: 000055cc3886eb00 R14: 000055cc3886f590 R15: 0000000000000001
    [ 2064.342857]
    [ 2064.343226] Allocated by task 12438:
    [ 2064.344057]  kasan_save_stack+0x1c/0x40
    [ 2064.345079]  __kasan_kmalloc+0x84/0xa0
    [ 2064.345933]  kmem_cache_alloc_trace+0x13b/0x220
    [ 2064.346953]  dlm_posix_unlock+0xec/0x720 [dlm]
    [ 2064.348811]  do_lock_file_wait.part.32+0xca/0x1d0
    [ 2064.351070]  fcntl_setlk+0x281/0xbc0
    [ 2064.352879]  do_fcntl+0x5e4/0xfe0
    [ 2064.354657]  __x64_sys_fcntl+0x11f/0x170
    [ 2064.356550]  do_syscall_64+0x3a/0x80
    [ 2064.358259]  entry_SYSCALL_64_after_hwframe+0x44/0xae
    [ 2064.360745]
    [ 2064.361511] Last potentially related work creation:
    [ 2064.363957]  kasan_save_stack+0x1c/0x40
    [ 2064.365811]  __kasan_record_aux_stack+0xaf/0xc0
    [ 2064.368100]  call_rcu+0x11b/0xf70
    [ 2064.369785]  dlm_process_incoming_buffer+0x47d/0xfd0 [dlm]
    [ 2064.372404]  receive_from_sock+0x290/0x770 [dlm]
    [ 2064.374607]  process_recv_sockets+0x32/0x40 [dlm]
    [ 2064.377290]  process_one_work+0x9a8/0x16e0
    [ 2064.379357]  worker_thread+0x87/0xbf0
    [ 2064.381188]  kthread+0x3ac/0x490
    [ 2064.383460]  ret_from_fork+0x22/0x30
    [ 2064.385588]
    [ 2064.386518] Second to last potentially related work creation:
    [ 2064.389219]  kasan_save_stack+0x1c/0x40
    [ 2064.391043]  __kasan_record_aux_stack+0xaf/0xc0
    [ 2064.393303]  call_rcu+0x11b/0xf70
    [ 2064.394885]  dlm_process_incoming_buffer+0x47d/0xfd0 [dlm]
    [ 2064.397694]  receive_from_sock+0x290/0x770
    ---truncated---

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://src.uniontech.com/#/security_advisory_detail?utsa_id=UTSA-2025-989147
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?6588af74");
  # https://lore.kernel.org/linux-cve-announce/2025022652-CVE-2022-49407-2755@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?9686329f");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-49407");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:C/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2022-49407");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2022/07/15");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/11/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/11/05");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Unity Linux Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info2.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/UOS-Server/release", "Host/UOS-Server/rpm-list", "Host/cpu");

  exit(0);
}
include('rpm2.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_product = get_kb_item('installed_os/local/SSH/0/product');
if (isnull(os_product) || 'UOS Server' >!< os_product) audit(AUDIT_OS_NOT, 'UOS Server');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'UOS Server');
if (! preg(pattern:"^20.1070a([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1070a', 'UOS Server ' + os_version);

if (!get_kb_item('Host/UOS-Server/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('aarch64' >!< cpu && 'amd64' >!< cpu && 'loongarch64' >!< cpu && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'UOS Server', cpu);


var constraints = [
  {
    'release': '20',
    'sp': '1070a',
    'pkgs': [
      {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070a', 'cpu':'loongarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070a', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  }
];

var os_release = get_one_kb_item('installed_os/local/SSH/0/release');
var os_sp = get_one_kb_item('Host/*/minor_release');

var flag = 0;
var reference;
var sp;
var _cpu;
var el_string;
var rpm_spec_vers_cmp;
var epoch;
var allowmaj;
var exists_check;
var cves;
foreach var constraint ( constraints ) {
  # Check that the target release is equal to the affected release
  if (!empty_or_null(constraint['release'])){
    if (constraint['release'] != os_release) continue;
  }
  if (!empty_or_null(constraint['sp'])){
    if (constraint['sp'] != os_sp) continue;
  }
  foreach var pkg ( constraint['pkgs'] ) {
    reference = NULL;
    sp = NULL;
    _cpu = NULL;
    el_string = NULL;
    rpm_spec_vers_cmp = NULL;
    epoch = NULL;
    allowmaj = NULL;
    exists_check = NULL;
    cves = NULL;
    if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
    if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
    if (!empty_or_null(pkg['cpu'])) _cpu = pkg['cpu'];
    if (!empty_or_null(pkg['el_string'])) el_string = pkg['el_string'];
    if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
    if (!empty_or_null(pkg['epoch'])) epoch = pkg['epoch'];
    if (!empty_or_null(pkg['allowmaj'])) allowmaj = pkg['allowmaj'];
    if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
    if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
    if (reference &&
        ## (no known rpm to check OR known rpm_exists)
        (!exists_check || rpm_exists(rpm:exists_check)) &&
        rpm_check(sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj, cves:cves)) flag++;
  }
}


if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'kernel');
}